Service and Billing Service

In October 2019 my account was suddenly suspended. When I called in to query as to why MTN decided to suspended my account I was told that my account was in arrear because MTN had made an error during billing. I have been a loyal client for many years and to deal with a rude agent who cannot provide an exact answers only that she will activate the account and I am expected to pay the balance by 24/11/2019. I went into head office (on 14th avenue) to enquiry how my account came to being in arrear and was told Billing does not work on weekends. To my surprise the agent also told me that MTN changed insurers which could be the reason why none of the correct debit orders went off. "HOW IS THIS MY ISSUE!" including that I was meant to be informed of the change. "NEVER HAPPENED!"This is time and energy being wasted with a company who could care less about service to its customer. I called in again on the 04/11/2019 and was dealing with an agent on how I can go about paying for the error made on my account. The agent was unable to clarify any of my concerns stating that she will call me back as she needs to speak to her manager. "WAS NEVER CALLED AGAIN". This it utterly ridiculous that clients are made response to follow up on changes made internally & do their own customer service to ensure that their account is in order and made liable for errors made by the company!